Valve chest for rock drills



"Sept. 15, 1925 C. C. HANSEN vALvE CHEST FOR ROCK DRILLS Filed Nov. 92 1921 Hi5 ATTO EY Patented Sept. 15, 1925.

UNITED STATES PATENT OFFICE.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNDN TC INGERSOIiIi-RAND COMPANY, OF JERSEY CITY, NEW; JERSEY, A CORPORATION OF NEvV JERSEY.

VALVE CHEST FOR ROCK DRILLS.

Application filed November 29, 1921.

To all whom it may concern:

Be it known that I, GnARLns C. Hansen, a citizen of the United States, and a resident of Easton, county of Northampton, and Eltate of Pennsylvania, have invented a certain Valve Chest for Rock Drills, of which the following is a specification, accompanied by drawings.

This invention relates to fluid actuated rock drills, more especially of the hammer type, but relates in particular to the valve chest construction for the motive fluid distributing valve.

A valve chest and spool valve of the type to which this construction is applied, is disclosed in the copending application of Lewis G. Bayles, Serial #451,661, filed March 12, 1921, for spool valve for rock drills, which application is assigned to Ingersoll-ltand Company. In such a valve chest, bushings in which the valve slides are adapted to be inserted into the valve chest from opposite ends, and the object of the present invention, is to provide a construction which insures the proper assembling of the bushings in the valve chest and prevents the interchanging of the bushings. My valve chest construction is simple, cheap to manufacture and readily lends itself to production in rock drills on a large scale.

Further objects of the invention will here inafter appear, and the invention is illus trated in one of its preferred forms in the accompanying drawings, in which- Figure 1 is a top plan view partly in horizontal section of so much of the back end portion of a rock drill as will serve to illustrate the invention,

Figure 2 is a side elevation of the same portion of the drill, partly in longitudinal section,

Figure 3 is a detail perspective View in longitudinal sectional elevation of the two bushings, adapted to be inserted in either end of the valve chest.

Figures 4 and 5 are detail diagrammatic end views of the valve chest and bushings, taken from opposite ends partly in section, and illustrating the manner in which 1 prevent the wrong bushing from being inserted in a given end of the valve chest.

Referring to the drawings, a portion of the cylinder A of a rocl drill of the hammer type is shown, having the hammer piston B Serial No. 518,679.

reciprocating therein and provided with the red ced shank or extension C guidedin the front cylinder washer D and adapted toimpart blows of impact to the shank of the drill steel, not shown. Any suitable means may be provided for imparting rotation to the dril steel, in this instance, a portion of the rotating device being indicated the ratchet ring E'located between the plate F and the back head G. The rifle barH engages the piston B in the usual manner. The water tube J with water tube inlet K and remainder of the back head construction, need not be further described, as it forms no part of the present invention] The sunoly and distribution of motive fluid for operating the tool is controlled-by the usual throttle valve L having thehan'dle O and the spool valve'P mounted in the valve chest Q, adapted to be secured to the side of the cylinder A as by means of the bolts R. In this instance, the valve is shown extending transversely across the valve chest, as a convenient construction.

The parts of the drill cylinder are secured together by the usual through bolts S. The throttle valve L in the valve chest controls the inlet T and motive fluid entering the inlet passes through the throttle valve to the supply passage U in the valve chest, which leads to the inlet ports V controlled by the distributing valve V a It is to be understood, that the cylinder A and valve chest Q; are formed with suitable ports and passages for distributing motive fluid to both ends of the cylinder, and for exhausting the fluid from the cylinder, as shown in detail in the aforesaid co-pending application, Serial No. 451,661 so that the details of these ports and passages will not be further referred to herein. As in that application, the valve P is shown sliding on a bolt V], and within the bushings X and Y,

which bushings are adapted to be insertedfrom opposite ends into the bore of the valve chest. The bushings X and Y are formed with the radial ports X. and Y respectively, through which motive fluid passes alternately to the forward and rearward ends of the piston.

These bushings, as shown, are separated at the center, leaving a space Z communicating with the exhaust port a, and after the bushings and valve have been assembled in the valve chest, the bolt W is inserted and tightened by means of the nut 79, to hold the bushings in position. A

In order to insure the proper assembling of the bushings in the valve chest, portions of each of said bushings'are made unsymmetrical, so that the bushing for one end of the valve chest will not fit the other end of the valve chest. A simple and convenient way of constructing the valve bushings with unsymmetrical portions is to flatten the peripheries of the flanges c and d, at unequal distances frolnthe centers .or longitudinal axes of the bushings. By providing portions on the valve chest with which the flattened portionsof the bushing flanges are adapted tocooperate, I am enabled to insure the proper assembling of the bushings.

In the presentinstan'ce, the flattened portion 0 of the flange c of the bushing X is nearer the axis ofthe bushing than the flattened portion f of the said flange. As shown in detail in Figure 3, the distance 2 is less thanthe distance .3. Likewise, the flattened portion got the flange (Z of the bushing Y, is at a lesser distance from the center or longitudinal axis of said bushing than the flattened portion Jr of 'the'flange. In the detail drawings, in Figure 3, the distance 4; is less than the distance 5.

The bushing .X is shown assembledinthe proper end of the valve chest in Figures 1 and 2, in which case the flat portion 6 lies opposite the wall jot the valve chest, and the flat portion f lies opposite the wall/c of the cylinder, which might if (desired be a portion ofthe valve chest. The bushing Y is alsoshown inthe proper end of the valve chest in Figures 1 and 2.

By'referring to Figurest andi5 it will'be obviousthat itan attempt is made to insert the bushing Y into the valve chestin the end in which the bushing, X belongs, the 'flattened portion h of-the flanged of the bush-- ing Y, which is at .thegreater distance from the center, will overlap the wall 7' of the valve chest and preventthe b'ushing Y from being inserted :into the end of the valve chest. Similarly, if the bushing vX were attempted to be inserted in the end of the valve chest in which the bushing Y belongs, the flattenedportion of the bushing X which is at the greater distance from the center, would interfere with the wall j of the valve chest, and the bushing could not beinserted. I thus insure in a simple and eflicient manner that'a valve bushing is always inserted in the -,proper end of the valve chest, so that. theproper ports in the bushings correspond with the proper ports in the valve chest. w

The'outer faces-of the bushings are "also preferably grooved radially,-as shown at '0 and-p and copper gaskets or locking washers' g are preferably inserted between the head 7" of the bolt and the bushing Y and between the nut b and the bushing X. These locking '=WELSl181S maybe tforrned with radial projections 8, one of which is bent outwardly to engage the head or nut of the bolt, andanother=is'bentint0'the groove #0 or pot a b'ushing,in'order'to lock-the parts.

I claim:

1. In a fluid actuated rock drill, the combination of a cylinder and piston, a valve chest at the side of the cylinder, a distributing valve in said valve chest, removable valve chest bushings tor the ends of the valve chest, each bushing havinga flange formed with two flattened peripheral portions, the said flattened portions on each flange being at differentdistances from the center of the bushing, and a stop for each bushing formed by the walls at the ends of the valve chest, both stops being located-on the same side of the longitudinal axis of the valve chest adjacent the onenings tor the bushings, the vdistance fromthe longitudinal axis of the bushing to one of the flattened peripheralportions being greater than the distance from that longitudinal axis to the stop and the distanceifrom the said longitudinal axis to the other of said flattened peripheral portionsbeing less than the distance from said axis to said stop, whereby neither .one of the bushings can be fitted into the valve chest opening provided for the other bushing.

2. vIn a fluidiactuated rock drill,-the combination of a cylinder and ,piston, a valve chest at theside of the cylinder, a dis- H- trib'uting valve insaid valve chest, removable valve chest bushings forthe ends of the valve chest, eachbushing having a flange formed with two flattened peripheral portions, the said flattened portions on each flange 'being at different distances-from the centerof the bushing,-the flattened portions which are at the same distance fromthe center being on the sameside of the longitudinal axisof each bushing, and a stop for each bushing formed by the walls at the ends of the valve chest, both stops being located on the same sidezof the longitudinal axis-of the valve chest adjacent the openings for the bushings, the distance from the longitudinal axis of the bushing to one-of the flattened peripheral portions being greater than the distance from that longitudinal axis. to the stop and the distance from the said longitudinal axis-to the other of said flattened-peripheral portions being less than the distance fromsaid axis to said stop, whereby neither one of the bushings can be Ifitted intothe valve chest opening provided for theother buShing.

In testimony wvhereof ?I have signed this specification.

CHARLES o HANSEN. 

